I'm far more into cardio that weightlifting but your comment that weightlifting "does [nothing]... besides getting stronger" is demonstrably false.
> All participants were given cognitive tests at the beginning and end of the study and 12 months after they finished the study. The group that did the weight training scored significantly higher at the end of the study than at the beginning and retained that gain at 12 months. The gain in test scores was also greatest for those who had the greatest gains in strength. The scores of the group who performed stretching exercises declined somewhat.
> All participants were given cognitive tests at the beginning and end of the study and 12 months after they finished the study. The group that did the weight training scored significantly higher at the end of the study than at the beginning and retained that gain at 12 months. The gain in test scores was also greatest for those who had the greatest gains in strength. The scores of the group who performed stretching exercises declined somewhat.
https://www.health.harvard.edu/mind-and-mood/weight-training...